<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18/babel.min.js"></script>
</head>

<body>
  <div id="app"></div>
  <script type="text/babel">

    /* 
      当表单的value受state控制,则我们称作为受控表单
        -受控表单的三种用法
          1.表单的初始值受控  直接书写defaultValue属性
          2.表单是只读表单(设置了readOnly={true}) 直接设置value也是可以的
          3.数据双向绑定:表单通过value受控,然后需要绑定onChang事件,事件中获取当前表单的值修改state
    */

   class App extends React.Component{

    state={
      name:'张三',
      age:18,
      hobby:'唱歌'
    }

    render(){
      // 受控表单  双向绑定
      const{name,age,hobby}=this.state
      return( <div>
         姓名:<input type="text" value={name} onChange={this.changeForm("name")}/>
         <br/>
         年纪:<input type="text" value={age} onChange={this.changeForm("age")}/>
         <br/>
         爱好:<input type="text" value={hobby} onChange={this.changeForm("hobby")}/>
         <br/>
         <button onClick={this.handle}>提交</button>
        </div>)
    }



    changeForm=(type)=>{
      return (e)=>{
        const{value}=e.target
        this.setState({
          [type]:value
        })
      }
    }

    // changename=(e)=>{
    // const {value}=e.target
    // this.setState({
    //   name:value
    // })
    // }

    // changeage=(e)=>{
    // const {value}=e.target
    // this.setState({
    //   age:value
    // })
    // }

    // changehobby=(e)=>{
    // const {value}=e.target
    // this.setState({
    //   hobby:value
    // })
    // }

    handle=()=>{
      const{name,age,hobby}=this.state
      console.log(name,age,hobby)
    }
   }

   const root=ReactDOM.createRoot(document.getElementById("app"))
   root.render(<App/>)
  </script>
</body>

</html>